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Since these new roller cams are going to cost me twice the price,
I was leaning towards a 53 mm cam
What's the advantage over a standard cam journal?

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I would go with the standard Ford size, which is 55 MM I think The larger journal sizes allow you to have a cam ground with more lift and not have to reduce the size of the base circle or grind the cam in closer to the center of the cam, to get the additional lift

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